of Edinburgh , Session 1881-82. 
815 
mercury, their introduction would increase (as in fact is necessary) 
the constant A above, but would have comparatively little effect on 
the value of B, which is the quantity really sought. 
5. Vocalisation and Articulation. By the Bev. J. L. Blake. 
Communicated by Dr. Crum Brown. 
(Abstract.) 
In this paper the . author discusses the mechanism of speech, and 
the character of the vowels and consonants which occur in the 
English language. He points out the importance of attending to 
the proper division of words into syllables, and of clearly articulat- 
ing consonants. He shows how his theory of monopressures 
facilitates the correct reading of poetry. 
BUSINESS. 
Mr. Andrew Jameson and Mr. J. A. Wenley were balloted for 
and declared duly elected Fellows of the Society. 
Monday, Vlth Jidy 1882. 
Professor BALFOUB, Vice-President, in the Chair. 
The following Communications were read 
1. On the Order of Succession of Bocks in the North-West 
Highlands. By Professor Heddle. 
2. On the Botation of the Plane of Polarization by Quartz, 
and its relation to Wave-Length. By W. Peddie. 
Communicated by Professor Tait. 
The angular rotation of the plane of polarization of light-rays in 
